Stroke control mechanism for pumps



June 1l, 1957 p K, SE1-ER 2,795,191

STROKE: CONTROL MECHANISM FOR PUMPS Filed Aug. 26, 1955 2 sheets-sheet 1v O l @zam/Mm ATTORNEY June 1l, 1957 P. K. vSE1-ER STROKE CONTROL MECHANISM FOR PUMPS 2 Sheets-Sheet? Filed Aug. 26, 1953 ATTORNEY g5 Fic. 6

.acasefof the.assembly.

United States PtCD CONTROL MECHANISM FOR' l This invention relatesto=improvements in stroke con- 'ftrolmechanism for chemicalor hydraulic pumpspof the tgeneraltype shown and described inrmy. priouLetters Pat- :ent No. 2,564,793, dated August 21, 1951.

uOne ofthe objects of the invention is togprovide a 7:micrometer adjusting means which..iscontained-.wholly ywithinthepumpgear case, and is-completely immersed in ,-oil at kall-times to insure proper lubrication ofthe-work` .ring parts. n, l A Another objectieftheinvention-gisftosproviderarcontrol rrnechanism for a pump strokeYim-Whch maximum :and :minimum adjustments arereadily obtained andceurately determined through the operationof,atsinglegelementpthe single adjusting element being available for adjustment through a normally lcoveredppeningformed in the gear A'further object "of the 'invention is v'to provide 'a control mechanism in which the range of movement of the adjusting parts is constant throughout the limits of the adjustment andthe parts of the adjusting mechanism are suspended in a position to maintain the adjusting element permanently available for manipulation regardless of the position of the pump mechanism.

Other objects of the invention reside in the novel construction and arrangement of parts, whereby critical adjustments are available at all times and the adjustments are permanent in character in that variation from a stipulated adjustment during normal operation of the pump is not possible.

Other objects of the invention will more clearly hereinafter appear by reference to the accompanying drawings forming a part of the instant specification, wherein like characters of reference designate corresponding parts throughout the several views, in which:

Fig. l is a top plan view of the assembly;

Fig. 2 is a vertical section on line 2 2 of Fig. 1;

Fig. 3 is a transverse section on line 3-3 of Fig. 2;

Fig. 4 is a sectional view on line 4-4 of Fig. 3;

Fig. 5 is a view of the control mechanism adjusted for minimum stroke;

Fig. 6 is a similar view showing the arrangement of the stroke mechanism for maximum adjustment of the stroke with the minimum adjustment illustrated in dotted lines; and

Fig. 7 is a perspective view of the adjusting mechanism.

ln the disclosure of the instant invention the pump assembly includes a rectangular gear housing including base plate 1, side walls 2 and 3, end walls 4 and 5, and cover plate 6. The base plate 1 is shown as projecting beyond the side walls 2 and 3 of the gear housing to provide for the utilization of the securing means, illustrated as stud bolts 7. The front end wall 5 is formed with an opening 8 through which a portion of the pump cylinder structure extends, to be hereinafter described, while the rear end wall 4 is formed with an opening for the reception of the main drive shaft 9, as best shown in Figs. 1 and 2. The cover plate 6 is provided with an opening positioned to provide access to the control mechanism,

2,795,191 Patented .Iune 11, 1957 ice ' thejopening 10, normally being covered by a cap plate 11 pivotally mounted ,on'the pivot pin 12. {Th'e lassembly will normally bedriven from an electric mQtor,lth1'ot 1`gh a'V-belt 14, which drives'the 1shaft-9 5 fthrough'the pulleys 15 mounted thereon, thefshaft 9-being mounted inbea'rings 16 and-17 supported ontheA inner faces ofthe end w'alls4 and 5v of'the'housing. The-drive l shaftl 9 is provided with aworm gear 18ewhich drives the gear"19 'which is' keyed to and-drives 'at relatively'low 10 speedthetransverse shaft 20- mounted in' bearings 21- and `'22supportedby'theside walls'Z andv 3, respectively. The Ybearing :22 isffixed' to" removable wall plate 23-secured totthe` side-wall 3by b olts 24 to permit removal of lthe bearingI 22,andassembly and'disassemblyof the mechaf ni`sm-whennecessary. #Fixed byr keyingA or otherwise, a y.eam 25 is seeuredrto-theshaft 20 driven by the gearf 19 -tthroughthe 1worm 18 from the source'of power.

The pump assembly includes the'pump -cylinder30 having 'inlet connection 31 and outlet f conne'ction'-32, these finlet"and=`outlet connections being-providedwithlthe dual tehecfle valves 33'and- -34,-respecti-vely, to provide -forthe rilow'ofmaterialinto andoutfof'the pump cylinder. The pump eyli-nderj30v islsupported: Aby the pump castingfSS, s't-hevlatter having the reduced inner extremity 36 which projects through the openinglS inthe front'wall S-of'the gear housing, the pump casting includingeapacking box ini-whichthepacking-'37 is arrangedand this packing 37 il isfa'djustabley .by meansY of packing lnut138,.;las fshown lin -Flg; 2. fThei'pump pistonrisshownassealed-by packing 89.-. adjustedifbymeans of picking 1 nut .40 andi lubricated ithrough'tthe lubricant passageway rcontr'ol 1 mechanisml as 1211341 mediallyofthe'packing. iThe-pump pistondsshown at 42 and is pivotally connected by pivot pin 43 to the push rod 44. The push rod 44 operates through the packing 37 heretofore mentioned and the pivot pin 43 permits suflicient flexing of the piston drive mechanism to perform the required function. An indicator disc 45 is illustrated at the joint between the piston 42 and the push rod 44, this indicator disc being associated with a scale 46 on the pump casting for checking the pump stroke.

The drive transmission between the cam 25 mounted on the driven shaft 20 in the gear box and the push rod 44 includes the micrometer control by means of which 45 the stroke of the pump may be regulated and predetermined in accordance with requirements. This control mechanism is mounted on a pivot pin which is bolted to the vertical side wall 2 of the gear housing and includes a forked member having an upper bearing 51 50 mounted on the pivot pin 50, the outer arm of the forked member being indicated at 52 and projecting rearwardly and downwardly as at 53 to engage the back face of the cam 25. The front arm 54 of the forked member extends downwardly and embraces the front face of the 55 cam 25, as shown in Fig. 2, these arms 52 and 54 being properly spaced to provide just sufficient clearance for the proper operation of the parts by the cam. The arm 52 is sufficiently resilient and reduced at its depending portion 53 in a manner to provide proper facilities for adjusting the spacing between the arms and simultaneously providing essential resiliency between the face surfaces abutting the cam 25.

The `forked arm 54 is formed with a milled slot 55 which extends transversely through and from one end of the forked arm 54 to a point 56 adjacent the upper extremity of the arm. Formed medi'ally of the longitudinally extending slot and longitudinally of the forked arm 54, is a bore 57, see Fig. 4, and in the 'annular bore 57 is positioned a slidable cylindrical block 58, see Fig. 3, this slidable block 58 being provided on opposite sides with projecting bearings 59 and 60, these bearings extending laterally through the milled side walls of the slot ber 61, asbest shown in Fig. 7. The beatigs'lsgd are clamped to the extremities of theAyoke 61 by cap plates 62 secured in `position by stud bolts 63 as `shown vin`Fig". 4. The base64 of the yoke member `61't1rr`1i1`tlates labat wall tongue lelement'S whichA secured by a mln; the'- presentdevelopment'thefscrew 55 will be,` Ntkhrealdedlto provide 111ic'romet`-erAadjristrnerits to permit l `regulationV ofthe pump Ifor minute, variationsin'the'discharge. Theradjustment is made `by swinging the `cap pivot, which willlexposetheupper `extremity 68J of the`A l screw 55, thisV upper Aextremity 68 being transversely slotted fornthc receptionof ascrewdri'ver or analOgOUS implement. -The rotationgof the screw 55 ,will move the ,4 block 58 whichtis connected through the lateral projections 59 and 60 tothelyoke member `61 to modify the the drive Vmechanism and makes available the micrometer screw S5 and the related parts.

What I claim is: t,

Injapump assembly having a `pump chamber and a piston zreciprocable in the chamber, means for reciprocating the piston and varying the length of the lstroke thereocomprising a shaft including a cam on the shaft,

means for rotating the shaft, a U-shaped member, a xed pivot, pin positioned adjacent `the shaft, the U-shaped member being pivotally mounted on the pin and having itsarms'str'addling the saidfcam, an arm of said U-shaped member having a longitudinal bore therein, a block slid` able in Saidbore, la screw threaded through said block and secured against longitudinal movement in the bore so that rotation of the screw will move the block axially in the longitudinal bore, the arm having oppositely positioned vertically extendingslots therein, said block having bearing pins extendingthrough said slots, a connecting rod having a forked end straddling the block and having its forks `pivotally connected, one to each of the said bearing pins, and a piston pivotally connected to the connecting rod, rotation of the said screw moving the block toward or froml the pivotallpoint of the U-slraped member and thereby varying the stroke of the piston.

References Cited in the le of this patent iUNlTED STATES PATENTS 278,084 Bogert May 22, 1883 536,430 Higgins Mar. 26, 1895 856,888 Laflin- Iune 1l, 1907 1 968,046 GriggsA et al. Aug. 23,` 1910 1,762,114 Berdon June 3f 1930 A1,899,295 Schulze Feb. 28,` 1933 2,031,609 Logue Feb. 25, 1936 2,503,907 Heller Apr. 11, 1950 2,548,738 Orlich4 Apr. 10, 1951 '2,564,793'1 Seter Aug. 21,` 1951 2,587,395 Sheen Feb. 26, 1952 2,592,237 Bradley Apr. 8, 1952 i FOREIGN PATENTS 661,717 Germany June 25, 1938 

